In the present study, unsplit inshell (UIPN) and shelled kernel (SKPN) pistachio nuts (Antep type) were analyzed based on their dimensional properties such as particle density, sphericity, particle volume and surface area, where are important for the engineering applications, designs and calculations. The determination of some physical properties of the pistachio nuts is very difficult due to its ellipsoidal shape. In this study, sphericity (using a new model, MBayram-1 equation), particle density (using dimensional method), surface area (using a software method) and volume (using dimensional method) were determined. The average weight, particle volume, particle density, sphericity and surface area of UIPN were determined as 1.0852 +/- 0.134 g, 1278.31 +/- 156.17 mm(3), 0.00882 +/- 0.00128 g/mm(3), 0.00882 +/- 0.00128 and 645.22 +/- 47.83 mm(2), respectively. They were 0.427 +/- 0.059 g, 457.09 +/- 73.44 mm(3), 0.000940 +/- 0.000074 g/mm(3), 0.00825 +/- 0.00119 and 324.13 +/- 33.38 mm(2), respectively for SKPN. (C) 2011 Elsevier Ltd. All rights reserved.